Chapter 19 of 2363 min read
Torque, angular momentum and their conservation
Why this is asked: Angular momentum L = Iω is conserved whenever net external torque is zero, even as I itself changes — a skater pulling their arms in spins faster purely because I falls, with no external torque involved.
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- •The Sun rotates around its centre once in 27 days. What will be the period of revolution if the Sun were to expand to twice its present radius without any external influence? Assume the Sun to be a sphere of uniform density.
- •A uniform rod of mass 20 kg and length 5 m leans against a smooth vertical wall making an angle of with it. The other end rests on a rough horizontal floor. The friction force that the floor exerts on the rod is (take ):
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